That changes everything. It means the 1670 event was far more energetic than previously thought, the gas is moving far faster, and that the ideas of what caused the actual event can be tossed out a window.
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The new observations were made using the monster Gemini North telescope in Hawaii. They took spectra in the infrared, dissecting the light into vary narrow color bins, which allows the gas velocity to be accurately measured. Earlier observations had done this as well, but looked more toward the
inner part of the nebula, near the star where the gas isn t moving very rapidly; this time they looked at the very tips of the lobes (the short red arcs in the image), under the assumption that gas that got that far out is moving the fastest.
The Dark Energy Survey, a global collaboration including researchers at the University of Wisconsin–Madison, has released DR2, the second data release in the survey’s seven-year history. DR2 was the topic of sessions at the 237th Meeting of the American Astronomical Society, which was held virtually January 10-15.
The second data release from the Dark Energy Survey, or DES, is the culmination of over a half-decade of astronomical data collection and analysis with the ultimate goal of understanding the accelerating expansion of the universe and the phenomenon of dark energy, which is thought to be responsible for this accelerated expansion. It is one of the largest astronomical catalogs released to date. Keith Bechtol, assistant professor of physics at UW–Madison, has served as the DES Science Release co-coordinator since 2017, guiding the effort to assemble, scientifically validate, and document data releases for both cosmology analysis by the DES Collaboration and explorati
NGC 613, a barred spiral galaxy 67 million light-years away in the southern constellation of Sculptor, shows its stunning stellar markings in this image taken by the Hubble Space Telescope.
DOE/Fermi National Accelerator Laboratory
Shown here is the elliptical galaxy NGC 474 with star shells. Elliptical galaxies are characterized by their relatively smooth appearance as compared with spiral galaxies, one of which is to the left of NGC 474, which is oriented with South to the top and West to the left. The colorful neighboring spiral (NGC 470) has characteristic flocculent structure interwoven with dust lanes and spiral arms. NGC 474 is at a distance of about 31 megaparsecs (100 million light-years) from the sun in the constellation of Pisces. The region surrounding NGC 474 shows unusual structures characterized as tidal tails or shells of stars made up of hundreds of millions of stars. These features are likely due to recent (within the last billion years) mergers of smaller galaxies into the main body of NGC 474 or close passages of nearby galaxies, such as the NGC 470 spiral. For coordinate information, visit the NOIRLab webpage for this photo. (Photo: DES/NOIRLab
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